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Loans and Allowance for Loan Losses Loans and Allowance for Loan Losses (PCI Loans) (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 15, 2018 | May 01, 2018
Carrying Amount [Abstract] |  |  |  |  |
Loans Receivable, Net | $ 2,644,519,000 | $ 1,939,501,000 |  |  |
Loans and Leases Receivable, Net Amount | 2,616,822,000 | 1,918,499,000 |  |  |
Contractual Payments at Acquisition [Abstract] |  |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses | 889,000 | 14,000 |  |  |
Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Loans Receivable, Net | 15,937,000 | 259,000 |  |  |
Financing Receivable, Allowance for Credit Losses | (1,235,000) | (9,000) | $ (14,000) |  |
Loans and Leases Receivable, Net Amount | 14,702,000 | 250,000 |  |  |
Contractual Payments at Acquisition [Abstract] |  |  |  |  |
Financing Receivable, Net | 15,623,000 | 259,000 | 8,086,000 |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion | 910,000 |  | 1,200,000 |  |
Construction Loans [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Loans Receivable, Net | 50,619,000 | 107,594,000 |  |  |
Construction Loans [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Loans Receivable, Net | 2,872,000 | 0 |  |  |
1-4 Family residential properties |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Loans Receivable, Net | 373,518,000 | 293,667,000 |  |  |
1-4 Family residential properties | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Loans Receivable, Net | 2,206,000 | 0 |  |  |
Multifamily residential properties |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Loans Receivable, Net | 184,051,000 | 61,798,000 |  |  |
Multifamily residential properties | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Loans Receivable, Net | 3,891,000 | 0 |  |  |
Commercial real estate |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Loans Receivable, Net | 906,850,000 | 681,757,000 |  |  |
Commercial real estate | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Loans Receivable, Net | 6,946,000 | 251,000 |  |  |
Loans secured by real estate |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Loans Receivable, Net | 1,746,738,000 | 1,271,999,000 |  |  |
Loans secured by real estate | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Loans Receivable, Net | 15,915,000 | 251,000 |  |  |
Agricultural Loans [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Loans Receivable, Net | 135,877,000 | 86,631,000 |  |  |
Agricultural Loans [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Loans Receivable, Net | 4,000 | 0 |  |  |
Commercial and industrial loans |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Loans Receivable, Net | 557,011,000 | 444,263,000 |  |  |
Commercial and industrial loans | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Loans Receivable, Net | 15,000 | 8,000 |  |  |
Consumer Loan [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Loans Receivable, Net | 91,516,000 | 29,749,000 |  |  |
Consumer Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Loans Receivable, Net | 3,000 | 0 |  |  |
Financing Receivable, Allowance for Credit Losses | 0 | 0 | 0 |  |
Contractual Payments at Acquisition [Abstract] |  |  |  |  |
Financing Receivable, Net | $ 3,000 | $ 0 | $ 0 |  |
First BancTrust [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |
Contractual Payments at Acquisition [Abstract] |  |  |  |  |
Business Combination, Acquired Receivables, Gross Contractual Amount |  |  |  |  | $ 20,357,000
Certain Loans Acquired In A Transfer. Nonaccretable Difference |  |  |  |  | (4,231,000)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition |  |  |  |  | 16,126,000
Certain Loans Acquired in Transfer, Accretable Yield |  |  |  |  | 0
Business Combination, Acquired Receivable, Fair Value |  |  |  |  | $ 16,126,000
SCB Bancorp [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |
Contractual Payments at Acquisition [Abstract] |  |  |  |  |
Business Combination, Acquired Receivables, Gross Contractual Amount |  |  |  | $ 3,282,000 |
Certain Loans Acquired In A Transfer. Nonaccretable Difference |  |  |  | (688,000) |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition |  |  |  | 2,594,000 |
Certain Loans Acquired in Transfer, Accretable Yield |  |  |  | 0 |
Business Combination, Acquired Receivable, Fair Value |  |  |  | $ 2,594,000 |

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- Definition The aggregate deficiency of a loan's cash flows expected to be collected over the investor's initial investment in the loan. This relates to loans with deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References No definition available. + Details
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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition The aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References No definition available. + Details
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- Definition Amount of accretion recognized for the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities, with evidence of deterioration of credit quality. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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